@inproceedings{SIGMOD-1985-CliffordT,
	author        = "James Clifford and Abdullah Uz Tansel",
	booktitle     = "{Proceedings of the 15th ACM SIGMOD International Conference on Management of Data}",
	cdrom         = "SIGMOD85/P247.PDF",
	doi           = "10.1145/318898.318922",
	pages         = "247--265",
	publisher     = "{ACM Press}",
	title         = "{On An Algebra For Historical Relational Databases: Two Views}",
	year          = 1985,
}